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2. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

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4. List of formulae involving π - Wikipedia

   en.wikipedia.org/wiki/List_of_formulae_involving_π

   where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

5. Euler's identity - Wikipedia

   en.wikipedia.org/wiki/Euler's_identity

   is pi, the ratio of the circumference of a circle to its diameter. Euler's identity is named after the Swiss mathematician Leonhard Euler . It is a special case of Euler's formula e i x = cos ⁡ x + i sin ⁡ x {\displaystyle e^{ix}=\cos x+i\sin x} when evaluated for x = π {\displaystyle x=\pi } .

6. BrainPop - Wikipedia

   en.wikipedia.org/wiki/BrainPop

   BrainPop (stylized as BrainPOP) is a group of educational websites founded in 1999 by Avraham Kadar, M.D. and Chanan Kadmon, based in New York City. [1] As of 2024, the websites host over 1,000 short animated movies for students in grades K–8 (ages 5 to 14), together with quizzes and related materials, covering the subjects of science, social studies, English, math, engineering and ...

7. William Jones (mathematician) - Wikipedia

   en.wikipedia.org/wiki/William_Jones_(mathematician)

   William Jones, FRS (1675 – 1 July 1749 [1]) was a Welsh mathematician best known for his use of the symbol π (the Greek letter Pi) to represent the ratio of the circumference of a circle to its diameter. He was a close friend of Sir Isaac Newton and Sir Edmund Halley.

8. Category:Children's educational video games - Wikipedia

   en.wikipedia.org/wiki/Category:Children's...

   These are educational video games intended for children between the ages of 3 and 17. While most of these games have an EC (Early Childhood) rating according to the ESRB, some of these games have a K-A/E (Everyone) rating.

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